Composite film, display panel, manufacturing method of display panel and display panel mother board

Abstract

The invention provides a composite film, a display panel, a manufacturing method of the display panel and a display panel mother board. The display panel mother board comprises a display substrate and a composite film. The composite film comprises a first bonding layer, a first base material layer, a second bonding layer and a second base material layer which are sequentially stacked. The first bonding layer and the first base material layer form a supporting film, the second bonding layer and the second base material layer form a protective film, and the composite film is bonded to the non-display side of the display substrate through the first bonding layer. According to the display panel mother board with the structure, the problem that static electricity generated in the manufacturing process affects a final display product is solved.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular, to a composite film, a display panel and a manufacturing method thereof, and a display panel motherboard. Background Art

[0002] At present, the production process of organic light-emitting diode (OLED) products at the module stage includes a film tearing process. Static electricity is generated during the film tearing process. The static electricity will penetrate into the back channel of the thin film transistor (TFT) of the module during the film tearing process, thereby causing the characteristics of the TFT to shift and affecting the display effect. Summary of the invention

[0003] The first aspect of the present disclosure provides a display panel motherboard. The display panel motherboard includes a display substrate and a composite film. The composite film includes a first adhesive layer, a first base material layer, a second adhesive layer and a second base material layer stacked in sequence. The first adhesive layer and the first base material layer constitute a support film, the second adhesive layer and the second base material layer constitute a protective film, and the composite film is bonded to the non-display side of the display substrate through the first adhesive layer.

[0004] In the above scheme, the first adhesive layer and the first substrate layer serving as support films in the display panel motherboard increase the difficulty of static electricity generated by film tearing penetrating into the TFT back channel in the display panel motherboard, thereby improving the problem of bright or dark display quality of OLED products caused by the above static electricity.

[0005] In a specific embodiment of the first aspect of the present disclosure, the bonding strength between the second bonding layer and the first substrate layer is smaller than the bonding strength between the first bonding layer and the first substrate layer, and smaller than the bonding strength between the first bonding layer and the display substrate.

[0006] In the above solution, by limiting the bonding strength of different film layers of the composite mold, the efficiency of the film tearing process is improved without affecting the bonding strength between the support layer and the display panel motherboard.

[0007] In a specific embodiment of the first aspect of the present disclosure, the display panel motherboard includes a plurality of display panel sub-boards arranged at intervals, each display panel sub-board is provided with a bending area and a display area, and a plurality of first openings are provided on the composite film, each first opening penetrates the first adhesive layer and the first substrate layer, and corresponds to the bending area of ​​each display panel sub-board. For example, further, the orthographic projection of the first opening on the display substrate coincides with the corresponding bending area.

[0008] In the above scheme, the design of a first opening on the composite film layer not only reduces the risk of stress concentration during bending, but also can reduce the TFT characteristic offset on the display panel sub-panel corresponding to the end of the film tearing by preventing the static electricity generated during film tearing from accumulating near the bending area of ​​the display panel sub-panel, thereby improving the problem of darkening or brightening of the display quality of the display panel sub-panel.

[0009] In a specific embodiment of the first aspect of the present disclosure, a plurality of second openings are provided on the composite film, each second opening penetrates the first adhesive layer and the first substrate layer, and corresponds to the display area of ​​each display panel sub-plate. For example, further, in the direction from the display area to the bending area, the width of the second opening is smaller than the width of the first opening.

[0010] In the above scheme, by reducing the accumulation of static electricity generated when tearing the film in the display area, the difference in TFT characteristic offset caused by static electricity in different areas of the display panel sub-panel is further reduced, thereby reducing the difference in display brightness in different areas of the display panel sub-panel.

[0011] In a specific embodiment of the first aspect of the present disclosure, in the composite film corresponding to each display panel sub-panel, a plurality of second openings are provided on the composite film, the width of the second opening in the direction from the display area to the bending area is L1, the length of the display panel sub-panel in the direction from the display area to the bending area is L2, and L1 / L2≤0.01. For example, further, the cross-section of the second opening in the direction perpendicular to the display substrate includes a regular trapezoid and / or a convex shape.

[0012] In the above scheme, by setting a plurality of second openings, the accumulation of static electricity on the display panel sub-board is more effectively reduced, so as to improve the uniformity of the display brightness of the OLED product. Furthermore, by limiting the size of the second openings, the adverse effect of the second openings on the first adhesive layer and the first substrate layer as a support film to support the display panel sub-board is reduced. Furthermore, by limiting the shape of the cross section of the second openings, the accumulation of static electricity is prevented, and the risk of the second opening affecting the supporting effect of the first adhesive layer and the first substrate layer on the display panel sub-board is further reduced.

[0013] In a specific embodiment of the first aspect of the present disclosure, in a direction perpendicular to the direction from the display area to the bending area, the shape of the first opening includes a straight line; and / or the shape of the second opening includes a straight line or a curve, and / or, multiple second openings are crossed with each other in a grid shape.

[0014] In the above solution, by providing a variety of design solutions for the shapes of the first opening and the second opening, the adaptability of the solution can be improved.

[0015] The second aspect of the present disclosure provides a composite film, which includes a first adhesive layer, a first substrate layer, a second adhesive layer and a second substrate layer stacked in sequence. The first adhesive layer and the first substrate layer constitute a support film, and the second adhesive layer and the second substrate layer constitute a protective film.

[0016] In the above scheme, the support film in the composite film can not only play a supporting role, but also reduce the probability that the static electricity generated during the removal of the protective film will have an adverse effect on the characteristics of the TFT in the OLED product using the composite film.

[0017] In a specific embodiment of the second aspect of the present disclosure, the bonding strength between the second adhesive layer and the first substrate layer is less than the bonding strength between the first adhesive layer and the first substrate layer. For example, further, a plurality of first openings are provided on the composite film, and each first opening penetrates the first adhesive layer and the first substrate layer. For example, further, a plurality of second openings are provided on the composite film, and each second opening penetrates the first adhesive layer and the first substrate layer. For example, further, in the direction from the display area to the bending area, the width of the second opening is less than the width of the first opening. For example, further, the cross-section of the second opening in the direction perpendicular to the composite film includes a regular trapezoid and / or a convex shape. For example, further, in the direction perpendicular to the direction from the display area to the bending area, the shape of the first opening includes a straight line. For example, further, in the direction perpendicular to the direction from the display area to the bending area, the shape of the second opening includes a straight line or a curve, and / or, a plurality of second openings intersect each other in a grid shape.

[0018] In the above scheme, by designing the bonding strength between different film layers in the composite film, the first opening and the second opening, while ensuring that the supporting effect of the first bonding layer and the first substrate layer on the display panel sub-panel is not affected, the probability of static electricity accumulation, especially at the end of film tearing, is reduced, so that the composite film can improve the problem of large difference in TFT characteristic offset in different areas of the display panel sub-panel using it during the film tearing process.

[0019] A third aspect of the present disclosure provides a display panel, which includes a display substrate sub-panel, a first adhesive layer and a first base material layer, wherein the first adhesive layer bonds the first base material layer to a non-display side of the display substrate sub-panel.

[0020] In the above scheme, the TFT in the display panel is protected by the first adhesive layer and the first substrate layer, which reduces the impact of static electricity generated during film tearing on TFT characteristics, thereby improving the problem of uneven brightness of the display panel caused by static electricity generated during film tearing.

[0021] The fourth aspect of the present disclosure provides a method for manufacturing a display panel, which comprises: obtaining a display panel motherboard according to any one of the first aspects of the present disclosure; cutting the display panel motherboard to obtain a plurality of display panel sub-panels, the display panel sub-panels comprising a display substrate sub-panel and a cut composite film, the cut composite film comprising a cut first adhesive layer, a cut first base material layer, a cut second adhesive layer and a cut second base material layer stacked in sequence, the cut first adhesive layer being bonded to the non-display side of the display substrate sub-panel; tearing off the cut second adhesive layer and the cut second base material layer on the display panel sub-panel to obtain a display panel.

[0022] The manufacturing method of the display panel can effectively reduce the total amount of static electricity generated and the risk of static electricity accumulation, thereby improving the problem of dark or bright corners at fixed positions in low grayscale image quality of OLED products. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A cross-sectional view of a display panel motherboard provided in accordance with an embodiment of the present disclosure.

[0024] Figure 2 A schematic diagram of a planar structure of a display panel motherboard provided in one embodiment of the present disclosure.

[0025] Figure 3 for Figure 2 The cross-sectional schematic diagram of the display panel motherboard along M1-N1 is shown.

[0026] Figure 4 for Figure 2 The cross-sectional diagram of the display panel motherboard along M2-N2 is shown.

[0027] Figure 5 for Figure 2 The cross-sectional diagram of the display panel motherboard along M1-N1 is shown.

[0028] Figure 6 for Figure 2 The cross-sectional diagram of the display panel motherboard along M2-N2 is shown.

[0029] Figure 7 for Figure 2 The cross-sectional diagram of the display panel motherboard along M2-N2 is shown.

[0030] Figure 8 for Figure 2 The cross-sectional diagram of the display panel motherboard along M2-N2 is shown.

[0031] Fig. 9 A schematic diagram of the planar structure of a composite membrane provided in one embodiment of the present disclosure.

[0032] Fig.10A schematic diagram of the planar structure of another composite membrane provided in one embodiment of the present disclosure.

[0033] Fig.11 A schematic diagram of the planar structure of another composite membrane provided in one embodiment of the present disclosure.

[0034] Fig.12 A schematic diagram of the planar structure of another composite membrane provided in one embodiment of the present disclosure.

[0035] Fig.13 A schematic diagram of the planar structure of another composite membrane provided in one embodiment of the present disclosure.

[0036] Fig.14 A schematic diagram of the planar structure of another composite membrane provided in one embodiment of the present disclosure.

[0037] Fig.15 A schematic diagram of the structure of another composite membrane provided in one embodiment of the present disclosure.

[0038] Fig.16 A schematic structural diagram of a display panel provided in one embodiment of the present disclosure.

[0039] Fig.17 A schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure.

[0040] Fig.18 A flowchart of a method for manufacturing a display panel provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the process of realizing the present invention, the inventors found that there are the following problems in the related art: in the process of manufacturing OLED products such as flexible OLED products, after the corresponding process of the module of the OLED product is completed, specifically, after the OLED Array circuit is deposited on the glass substrate and the OLED light-emitting device is evaporated onto the Array circuit, the glass substrate is peeled off by the excimer laser annealing (ELA) process, and the module is attached to a protective film such as a Lami film. The Lami film belongs to a PET release film (polyethylene terephthalate, abbreviated as: PET). However, the Lami film is attached on the entire surface, which cannot be bent in the pad bending area for flexible OLED products. Therefore, the Lami film needs to be torn off, and after the Lami film is torn off, a support film is attached to the pad bending area. However, in the process of tearing off the Lami film, the colloid on the Lami film, such as the pressure-sensitive adhesive, generates separation static electricity between the film layer of the module, and these static electricity gradually penetrates into the back channel of the TFT in the module during the film tearing process, which will cause the TFT characteristics to shift, and the static electricity accumulation at the end of the film tearing is the largest, and the TFT characteristics shift is the largest. There is a problem of dim or bright display.

[0043] In view of this, the embodiments of the present disclosure provide a composite film, a display panel and a method for manufacturing the same, and a display panel motherboard. By designing the structure of the composite film, the static electricity generated during film tearing affects the characteristics of the TFT, thereby improving the display problem of the display panel.

[0044] At least one embodiment of the present disclosure provides a display panel motherboard. The display panel motherboard includes a display substrate and a composite film. The composite film includes a first adhesive layer, a first substrate layer, a second adhesive layer and a second substrate layer stacked in sequence. The first adhesive layer and the first substrate layer constitute a support film, the second adhesive layer and the second substrate layer constitute a protective film, and the composite film is bonded to the non-display side of the display substrate through the first adhesive layer. In this way, when the second adhesive layer and the second substrate layer as protective films are torn off from the first substrate layer, that is, when the display substrate is peeled off, the static electricity generated between the second adhesive layer and the first substrate layer will not directly penetrate into the display substrate, but will pass through the first substrate layer and the first adhesive layer in turn. In this way, at least part of the static electricity will be blocked by the first substrate layer and the first adhesive layer, thereby reducing the static electricity in the back channel of the TFT that penetrates into the module, reducing the TFT offset, thereby improving the problem of uneven TFT characteristic offset, and then improving the uniformity of the display brightness of the display panel motherboard.

[0045] In the following, the composite film, display panel and its manufacturing method, and display panel motherboard according to at least one embodiment of the present disclosure are described in conjunction with the accompanying drawings. In addition, as shown in the accompanying drawings, in at least one embodiment of the present disclosure, a spatial rectangular coordinate system is established with the surface where the display panel motherboard is located as a reference to define the positions of each film layer in the display panel motherboard. In the spatial rectangular coordinate system, the X-axis and the Y-axis are parallel to the surface where the display panel motherboard is located, and the Z-axis is perpendicular to the surface where the display panel motherboard is located.

[0046] In at least one embodiment of the present disclosure, Figure 1 As shown, the display panel motherboard 100 includes a display substrate 110 and a composite film 120. The composite film 120 includes a first adhesive layer 121 and a first substrate layer 122 constituting a support film, and a second adhesive layer 123 and a second substrate layer 124 constituting a protective film. The first adhesive layer 121 adheres the first substrate layer 122 to the non-display side of the display substrate 110 away from the display side, and the second adhesive layer 123 adheres the second substrate layer 124 to the side of the first substrate layer 122 away from the first adhesive layer 121. The display substrate 110 includes a base substrate and a thin film transistor, i.e., a TFT, located on the base substrate. In this way, the static electricity generated by tearing off the second adhesive layer 123, i.e., tearing off the protective film, needs to penetrate the first substrate layer 122 and the first adhesive layer 121 before reaching the side of the base substrate away from the TFT, and the static electricity can only penetrate the back channel side of the TFT and affect the characteristics of the TFT after penetrating the base substrate, which increases the difficulty of the static electricity penetrating the back channel side of the TFT, which is not conducive to the penetration of static electricity, thereby reducing the influence of the static electricity generated during the film tearing process on the characteristics of the TFT.

[0047] It should be noted that Figure 1 The structure of the display panel motherboard 100 is only schematically shown, and its structure, especially the specific structure of the display substrate 110, is not limited. The display substrate 110 may include a substrate and a display functionality located on the substrate, the display function layer includes a light-emitting device, the substrate may include a base substrate and a drive circuit layer, and the drive circuit layer includes a plurality of pixel drive circuits located in the display area. For example, the pixel drive circuit may include a plurality of transistors TFT, capacitors, etc., for example, formed in various forms such as 2T1C (i.e., 2 transistors (TFT) and 1 capacitor (C)), 3T1C, 7T1C or 8T1C.

[0048] For example, the driving circuit layer may include a buffer layer, an interlayer dielectric layer, a gate insulation layer, a planarization layer and multiple metal layers, wherein the interlayer dielectric layer, the gate insulation layer and the planarization layer may be set as one layer or multiple layers. These film layers may be located in the display area and extend to the wiring area, but these film layers may not be set in the area of ​​the wiring area away from the display area to increase the flexibility of the wiring area so as to meet the requirements of bending, etc.

[0049] In the display panel motherboard 100 provided in at least one embodiment of the present disclosure, the bonding strength between the second bonding layer 123 and the first base material layer 122 is smaller than the bonding strength between the first bonding layer 121 and the first base material layer 122, and is also smaller than the bonding strength between the first bonding layer 121 and the display substrate 110. In this way, the resistance when the film layer as a protective film is torn off from the display substrate 110 is relatively small, so as to improve the film tearing efficiency, and the bonding strength between the first bonding layer 121 and the first base material layer 122 as a supporting film and the display substrate 110 is not affected.

[0050] In the embodiments of the present disclosure, there are no specific restrictions on the parameters of the first adhesive layer 121, the first substrate layer 122, the second adhesive layer 123 and the second substrate layer 124 included in the composite film 120, such as the film layer thickness and structure, which can be determined according to the actual process and requirements.

[0051] For example, the materials of the first adhesive layer 121 and the second adhesive layer 123 are both pressure sensitive adhesive (PSA), the materials of the first substrate layer 122 and the second substrate layer 124 are both polyimide (PI), the first substrate layer 122 and the second substrate layer 124 can be a single-layer structure or a composite layer structure, and the present disclosure does not limit the thickness of each film layer, which can be designed according to actual needs and will not be elaborated here.

[0052] In a display panel motherboard 100 provided in an embodiment of the present disclosure, as Figure 2 As shown, the display panel motherboard 100 includes a plurality of display panel sub-boards 130 arranged at intervals. Specifically, four display panel sub-boards 130 are arranged at intervals on the display panel motherboard 100 in the X direction. Figure 3 It can be seen that each display panel sub-panel 130 is provided with a bending area BA and a display area AA, and the composite film 120 is provided with a plurality of first openings 140, each of which penetrates the first adhesive layer 121 and the first substrate layer 122 and corresponds to the bending area BA of each display panel sub-panel 130, that is, one first opening 140 is provided on the composite film 120 corresponding to the bending area BA of each display panel sub-panel 130. Specifically, the composite film 120 attached to the display substrate 110 is provided with four first openings 140 corresponding to the bending areas BA of different display panel sub-panels 130.

[0053] In the display panel motherboard 100 disclosed in the present invention, a design scheme of a first opening 140 is provided on the composite film 120, which not only reduces the risk of damage to the display panel sub-panel 130 due to stress concentration when the display panel sub-panel 130 is bent, but also can prevent the static electricity generated during film tearing from accumulating near the bending area BA of the display panel sub-panel 130, thereby reducing the TFT characteristic offset of the display panel sub-panel 130 corresponding to the bending area BA, thereby improving the problem of poor uniformity between the regional TFT characteristic offset of the display panel sub-panel 130 corresponding to the end of the film tearing and the regional TFT characteristic offset of other display panel sub-panels 130, and further improving the problem of reduced display quality of the display panel sub-panel 130.

[0054] It should be noted that the structure of the display panel motherboard 100 is not limited to the above example. For example, the arrangement, number, size, and spacing of the display panel sub-boards 130 on the display panel motherboard 100 are not limited to Figure 2 and Figure 3 In the scheme. For example, in addition to the display area AA and the bending area BA, the display panel sub-panel 130 may also include other areas. For example, a plane area is provided on the side of the bending area BA away from the display area AA, and the plane area can be a binding area; for another example, a fan-out area is provided between the display area AA and the bending area BA, and some functional wiring in the display area AA can extend from the display area AA through the fan-out area to the plane area, i.e., the binding area. For another example, the display panel may also include a non-display area located outside the display area AA. In addition, in the case where the display panel sub-panel 130 is provided with a bending area BA, a flexible substrate can be selected as the substrate substrate in the corresponding display panel motherboard 100. All of the above can be designed according to actual needs, and will not be elaborated here.

[0055] In the display panel motherboard 100 provided in at least one embodiment of the present disclosure, the orthographic projection of the first opening 140 on the display substrate 110 coincides with the corresponding bending area BA. Figure 4 As shown, the display panel sub-panel 130 includes a display area AA and a bending area BA, and a first opening 140 is provided on the corresponding composite film 120 on the display panel sub-panel 130, and the orthographic projection of the first opening 140 on the display panel sub-panel 130 coincides with the bending area BA. In this way, the design of the composite film 120 in which the first opening 140 coincides with the bending area BA in the above scheme can prevent static electricity from accumulating, especially in the edge area near the display panel sub-panel 130, and effectively improve the uniformity of stress release of the support film in the corresponding bending area BA, thereby improving the quality of the display panel sub-panel 130.

[0056] In a display panel motherboard 100 provided in an embodiment of the present disclosure, as Figure 5As shown, the display panel motherboard 100 includes a plurality of display panel sub-panels 130, each of which includes a display area AA and a bending area BA, and at least one second opening 150 is respectively provided on the composite film 120 corresponding to the display area AA of each display panel sub-panel 130. Specifically, the plurality of second openings 150 respectively correspond to the display area AA of the corresponding display panel sub-panel 130, and each second opening 150 penetrates the first adhesive layer 121 and the first substrate layer 122.

[0057] In the display panel motherboard 100 provided in at least one embodiment of the present disclosure, as Figure 6 As shown, for a certain display panel sub-panel 130, the corresponding composite film 120 is not only provided with a first opening 140 corresponding to the bending area BA of the display panel sub-panel 130, the orthographic projection of the first opening 140 on the display panel sub-panel 130 coincides with the bending area BA of the display panel sub-panel 130, but also provided with a plurality of second openings 150 corresponding to the display area AA of the display panel sub-panel 130. The plurality of second openings 150 are arranged at intervals and evenly distributed, and in the direction from the display area AA to the bending area BA, the width of the second opening 150 is smaller than the width of the first opening 140, specifically as shown in the X direction in the figure.

[0058] In the present disclosure, the design of the second opening 150 set on the composite film 120 in the area corresponding to the display area AA of the display panel sub-panel 130 can improve the accumulation of static electricity generated when tearing the film in the display area AA, and further reduce the difference between the TFT characteristic offsets affected by static electricity in different areas of the display panel sub-panel 130, thereby reducing the difference in display brightness between different areas of the display panel sub-panel 130.

[0059] In a display panel motherboard 100 provided in an embodiment of the present disclosure, as Figure 5 As shown, in the composite film 120 corresponding to each display panel sub-panel 130, a plurality of second openings 150 are provided on the composite film 120, the width of the second opening 150 in the direction from the display area AA to the bending area BA is L1, and the length of the display panel sub-panel 130 in the direction from the display area AA to the bending area BA is L2, and L1 / L2≤0.01.

[0060] In the above embodiment of the present disclosure, the size of the second opening 150 is limited to reduce the adverse effect of the opening on the first adhesive layer 121 and the first substrate layer 122 on the first adhesive layer 121 and the first substrate layer 122 acting as a supporting film to support the display panel sub-plate 130.

[0061] In the display panel motherboard 100 provided in at least one embodiment of the present disclosure, as Figure 7 and Figure 8As shown, the cross section of the second opening 150 in the direction perpendicular to the display substrate 110 includes a regular trapezoid or a convex shape. In this way, by limiting the shape of the cross section of the second opening 150, the surface area of ​​the second opening 150 in the first adhesive layer 121 is smaller than the surface area in the first base material layer 122, which can prevent static electricity from accumulating while further reducing the risk of the second opening 150 affecting the supporting effect of the first adhesive layer 121 and the first base material layer 122 on the display panel sub-plate 130.

[0062] It should be noted that the shape of the cross section of the second opening 150 in the display panel motherboard 100 in the direction perpendicular to the display substrate 110 is not limited to the above embodiments, and it can also be other schemes. For example, in the area corresponding to the same display panel sub-board 130, the shape of the cross section of part of the second opening 150 on the composite film 120 in the direction perpendicular to the display substrate 110 is a regular trapezoid, and the shape of the cross section of the remaining part of the second opening 150 in the direction perpendicular to the display substrate 110 is a convex shape. The second opening 150 with a regular trapezoidal cross section shape and the second opening 150 with a convex cross section shape can be arranged in an alternate arrangement or in a divided area. The above are designed according to actual needs and will not be repeated here.

[0063] In the embodiment of the present disclosure, the shapes of the first opening 140 and the second opening 150 are respectively defined.

[0064] In a display panel motherboard 100 provided in an embodiment of the present disclosure, as Fig. 9 As shown, the multiple first openings 140 corresponding to the multiple bending areas BA of the display panel sub-panel 130 on the display panel motherboard 100 are arranged in a straight line shape in the direction perpendicular to the direction from the display area AA to the bending area BA, i.e., in the Y direction, to ensure that a first opening 140 is arranged on the composite film 120 corresponding to the bending area BA of each display panel sub-panel. The specific design of the first opening 140 can refer to the above embodiment, and will not be repeated here. In this way, by setting the first opening 140 as a straight opening, the processing difficulty of the first opening 140 is reduced, and the production cost is saved. In addition, the first opening can also be set to other shapes, such as a curve, etc., which can be designed according to actual needs, and will not be repeated here.

[0065] In another embodiment of the present disclosure, a display panel motherboard 100 is provided, and different solutions are provided. Regarding the shapes of the multiple second openings 150 provided on the display panel motherboard 100 corresponding to the multiple display areas AA of the display panel sub-board 130, and each display area AA corresponds to the multiple second openings 150, for example, Fig.10As shown, in the direction perpendicular to the direction from the display area AA to the bending area BA, that is, the Y direction, the shapes of the plurality of second openings 150 are all linear, thus improving the processing efficiency of the second openings 150. Fig.11 As shown, in the direction perpendicular to the direction from the display area AA to the bending area BA, i.e., the Y direction, the shapes of the plurality of second openings 150 are all curved, such as wavy. In this way, the design of the second openings 150 can not only prevent static electricity from accumulating, but also play other roles, such as improving stress buffering and the stretching capacity of the module. For another example, Fig.12 As shown, the plurality of second openings 150 intersect each other in a grid shape, so as to more effectively reduce the probability of static electricity accumulation, improve the uniformity of TFT characteristic deviation values ​​in different regions of the display panel sub-panel 130 , and thus improve the display effect of the display panel sub-panel 130 .

[0066] The above embodiments respectively introduce solutions in which the composite film 120 in the display panel motherboard 100 is provided with a first opening 140 or a second opening 150. The following will introduce a solution in which the composite film 120 in the display panel motherboard 100 is provided with both a first opening 140 and a second opening 150. The specific contents are as follows.

[0067] In another embodiment of the present disclosure, a display panel motherboard 100 is provided with a plurality of first openings 140 corresponding to a plurality of bending areas BA of a display panel sub-board 130, and each bending area BA of a display panel sub-board 130 corresponds to a first opening 140. Meanwhile, a plurality of second openings 150 are provided on the display panel motherboard 100 corresponding to a plurality of display areas AA of the display panel sub-board 130. For example, Fig.13 As shown, in the direction perpendicular to the direction from the display area AA to the bending area BA, that is, the Y direction, the shapes of the first opening 140 and the second opening 150 are both linear. Fig.14 As shown, in the direction perpendicular to the direction from the display area AA to the bending area BA, ie, the Y direction, the first opening 140 is in a straight line shape, and the plurality of second openings 150 cross each other to form a grid shape.

[0068] It should be understood that the design scheme for the shapes of the first opening 140 and the second opening 150 in the display panel motherboard 100 is not limited to the above embodiments and the examples in the figures. For example, in the same display panel sub-board 130, in the direction perpendicular to the direction from the display area AA to the bending area BA, that is, in the Y direction, the shape of the first opening 140 is a straight line, and the shape of the second opening 150 is a curve, or the shape of the first opening 140 is a straight line, and the shape of the second opening 150 is a grid, and the grid is formed by the curved second opening 150, or the second opening 150 does not pass through the first opening 140, but only forms a grid in the area corresponding to the display area AA of each display panel sub-board 130. At the same time, the curved second opening 150 is not limited to the wavy shape in the above examples, and can also be other curves such as a broken line. In addition, although other areas of the display panel sub-board 130, such as the frame area or the extension area, are not mentioned in the embodiment, it can be known from the shapes of the first opening 140 and the second opening 150 that the first opening 140 and / or the second opening 150 can also be provided on the corresponding composite film 120 in these areas. All of the above can be designed according to the requirements of the display panel motherboard 100 or the display panel sub-board 130, and will not be elaborated here.

[0069] An embodiment of the present disclosure provides a composite film 120, such as Fig.15 As shown, the composite film 120 includes a first adhesive layer 121, a first substrate layer 122, a second adhesive layer 123 and a second substrate layer 124 which are stacked in sequence. The first adhesive layer 121 and the first substrate layer 122 constitute a support film, and the second adhesive layer 123 and the second substrate layer 124 constitute a protective film. Specifically, the composite film 120 is bonded to the non-display side of the display substrate 110 through the first adhesive layer 121. In this way, the support film in the composite film 120 can not only play a supporting role, but also reduce the probability that static electricity during the removal of the protective film will have an adverse effect on the characteristics of the TFT in the display panel using the composite film 120.

[0070] In the composite film 120 provided in one embodiment of the present disclosure, the bonding strength between the second bonding layer 123 and the first substrate layer 122 is smaller than the bonding strength between the first bonding layer 121 and the first substrate layer 122 , and further smaller than the bonding strength between the first bonding layer 121 and the display substrate 110 .

[0071] This disclosure will now refer to Figure 3-Figure 14 The structure of the composite mold is introduced as follows.

[0072] An embodiment of the present disclosure provides a composite film 120, on which a plurality of first openings 140 are provided, each of which penetrates the first adhesive layer 121 and the first substrate layer 122. The composite film 120 further corresponds to the bending area BA of each display panel sub-plate 130. In at least one embodiment of the present disclosure, the orthographic projection of the first opening 140 on the display substrate 110 coincides with the corresponding bending area BA.

[0073] An embodiment of the present disclosure provides a composite film 120 , on which a plurality of second openings 150 are provided, each second opening 150 penetrates the first adhesive layer 121 and the first substrate layer 122 , and further corresponds to the display area AA of each display panel sub-plate 130 .

[0074] In at least one embodiment of the present disclosure, in the direction from the display area AA to the bending area BA, that is, in the X direction, the width of the second opening 150 is smaller than the width of the first opening 140 .

[0075] In at least one embodiment of the present disclosure, in the area of ​​the composite film 120 corresponding to each display panel sub-panel 130, a plurality of second openings 150 are provided on the composite film 120, and the width of the second opening 150 in the direction from the display area AA to the bending area BA is L1, and the length of the display panel sub-panel 130 in the direction from the display area AA to the bending area BA is L2, and L1 / L2≤0.01.

[0076] In at least one embodiment of the present disclosure, a cross section of the second opening 150 in a direction perpendicular to the composite film 120 includes a regular trapezoid and / or a convex shape.

[0077] In at least one embodiment of the present disclosure, in a direction perpendicular to the direction from the display area AA to the bending area BA, ie, in the Y direction, the shape of the first opening 140 includes a straight line.

[0078] In at least one embodiment of the present disclosure, in the direction perpendicular to the direction from the display area AA to the bending area BA, i.e., the Y direction, the shape of the second opening 150 includes a straight line or a curve, and / or multiple second openings 150 intersect each other in a grid shape.

[0079] It should be understood that the first opening 140 and the second opening 150 in the structure of the composite membrane 120 in the embodiment of the present disclosure can refer to the description in the above embodiments and figures, and will not be described in detail here.

[0080] An embodiment of the present disclosure provides a display panel such as Fig.16As shown, the display panel includes a display substrate sub-panel 111, a first adhesive layer 121 and a first base material layer 122, and the first adhesive layer 121 bonds the first base material layer 122 to the non-display side of the display substrate sub-panel 111. In this way, under the action of blocking static electricity by the first adhesive layer 121 and the first base material layer 122, the amount of static electricity generated on the surface of the first base material layer 122 during the film tearing process that penetrates into the TFT back channel in the display panel is reduced, thereby reducing the brightness non-uniformity of the display panel caused by the static electricity generated during the film tearing process, and ultimately improving the display effect of the display panel.

[0081] In the display panel of at least one embodiment of the present disclosure, as Fig.17 As shown, a first opening 140 and a second opening 150 are provided on the first adhesive layer 121 and the first substrate layer 122, wherein the first opening 140 corresponds to the bending area BA of the display panel, and the second opening 150 corresponds to the display area AA of the display panel, and the design of the first opening 140 and the second opening 150 may refer to the above embodiments, which will not be elaborated here.

[0082] It should be understood that the structure of the display panel is not limited to the examples in the above embodiments and figures, and may also be set to other structures. For example, only the first opening 140 or the second opening 150 is set in the display panel. The above can be designed according to requirements and will not be elaborated here.

[0083] In the embodiments of the present disclosure, the display panel may be an organic light emitting diode display panel, a liquid crystal display panel, an electronic paper display panel, etc.

[0084] For example, the display panel in the embodiments of the present disclosure may be any product or component with a display function, such as a television, a digital camera, a mobile phone, a watch, a tablet computer, a laptop computer, a navigator, or the like.

[0085] An embodiment of the present disclosure provides a method for manufacturing a display panel. Fig.18 As shown, the manufacturing method of the display panel includes the following steps:

[0086] Step S01: Obtain a display panel motherboard. The structure of the display panel motherboard can refer to the relevant description in the above embodiments, and will not be described in detail here.

[0087] Step S02: Cutting the display panel motherboard to obtain multiple display panel sub-boards, the display panel sub-boards include a display substrate sub-board and a cut composite film, the cut composite film includes a cut first adhesive layer, a cut first base material layer, a cut second adhesive layer and a cut second base material layer stacked in sequence, and the cut first adhesive layer is bonded to the non-display side of the display substrate sub-board.

[0088] Step S03: tear off the cut second adhesive layer and the cut second substrate layer on the display panel sub-plate to obtain a display panel. The structure of the display panel can refer to the relevant description in the above embodiment, which will not be described here.

[0089] In the manufacturing method of the display panel provided by the present invention, after cutting the display panel motherboard, the corresponding part of the composite film on the single-piece sub-board is torn off to retain the film layer required for the OLED product, which can effectively reduce the amount of static electricity and the risk of static electricity accumulation, thereby improving the problem of dark or bright corners at fixed positions in low grayscale image quality of OLED products.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel motherboard, characterized in that: include: Display substrate; as well as A composite film comprises a first adhesive layer, a first substrate layer, a second adhesive layer and a second substrate layer stacked in sequence, wherein the first adhesive layer and the first substrate layer constitute a support film, the second adhesive layer and the second substrate layer constitute a protective film, and the composite film is bonded to the non-display side of the display substrate through the first adhesive layer.

2. The display panel motherboard according to claim 1, characterized in that: The bonding strength between the second bonding layer and the first base material layer is smaller than the bonding strength between the first bonding layer and the first base material layer, and smaller than the bonding strength between the first bonding layer and the display substrate.

3. The display panel motherboard according to claim 2, characterized in that: The display panel motherboard includes a plurality of display panel sub-boards arranged at intervals, each of the display panel sub-boards is provided with a bending area and a display area, and the composite film is provided with a plurality of first openings, each of the first openings penetrates the first adhesive layer and the first substrate layer, and corresponds to the bending area of ​​each of the display panel sub-boards; Preferably, an orthographic projection of the first opening on the display substrate coincides with the corresponding bending area.

4. The display panel motherboard according to claim 3, characterized in that: The composite film is provided with a plurality of second openings, each of the second openings penetrates the first adhesive layer and the first substrate layer, and corresponds to the display area of ​​each of the display panel sub-plates; Preferably, in a direction from the display area to the bending area, a width of the second opening is smaller than a width of the first opening.

5. The display panel motherboard according to claim 4, characterized in that: In the composite film corresponding to each of the display panel sub-plates, a plurality of second openings are provided on the composite film, a width of the second opening in the direction from the display area to the bending area is L1, a length of the display panel sub-plate in the direction from the display area to the bending area is L2, and L1 / L2≤0.01; Preferably, a cross section of the second opening in a direction perpendicular to the display substrate includes a regular trapezoid and / or a convex shape.

6. The display panel motherboard according to claim 4, characterized in that: In a direction perpendicular to the direction from the display area to the bending area, The shape of the first opening includes a straight line; and / or The second openings may have a straight line or a curved line, and / or a plurality of the second openings may cross each other to form a grid.

7. A composite membrane, characterized in that include: A first adhesive layer, a first base material layer, a second adhesive layer and a second base material layer are sequentially stacked, The first adhesive layer and the first base material layer constitute a support film, and the second adhesive layer and the second base material layer constitute a protective film.

8. The composite membrane according to claim 7, characterized in that The bonding strength between the second bonding layer and the first substrate layer is smaller than the bonding strength between the first bonding layer and the first substrate layer; Preferably, the composite film is provided with a plurality of first openings, and each of the first openings penetrates the first adhesive layer and the first substrate layer; Preferably, the composite film is provided with a plurality of second openings, and each of the second openings penetrates the first adhesive layer and the first substrate layer; Preferably, in the direction from the display area to the bending area, the width of the second opening is smaller than the width of the first opening; Preferably, the cross section of the second opening in a direction perpendicular to the composite membrane comprises a regular trapezoid and / or a convex shape; Preferably, in a direction perpendicular to the direction from the display area to the bending area, the shape of the first opening includes a straight line shape; Preferably, in a direction perpendicular to the direction from the display area to the bending area, the shape of the second opening includes a straight line shape or a curved line shape, and / or a plurality of the second openings intersect each other in a grid shape.

9. A display panel, characterized in that: The invention comprises a display substrate sub-plate, a first adhesive layer and a first base material layer, wherein the first adhesive layer adheres the first base material layer to the non-display side of the display substrate sub-plate.

10. A method for manufacturing a display panel, characterized in that: include: Obtain a display panel motherboard as described in any one of claims 1 to 6; Cutting the display panel motherboard to obtain a plurality of display panel sub-boards, wherein the display panel sub-boards include a display substrate sub-board and a cut composite film, wherein the cut composite film includes a cut first adhesive layer, a cut first base material layer, a cut second adhesive layer and a cut second base material layer which are sequentially stacked, and the cut first adhesive layer is bonded to the non-display side of the display substrate sub-board; The cut second adhesive layer and the cut second substrate layer on the display panel sub-plate are torn off to obtain the display panel.

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